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Merge remote-tracking branch 'origin/main' into develop

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Yang Huiting 3 days ago
parent 0a7a9074be 7dbeb6bb3b
commit 8b5a31f93b
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BackupUtils.java
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/*
* Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.micode.notes.tool;
import android.content.Context;
import android.database.Cursor;
import android.os.Environment;
import android.text.TextUtils;
import android.text.format.DateFormat;
import android.util.Log;
import net.micode.notes.R;
import net.micode.notes.data.Notes;
import net.micode.notes.data.Notes.DataColumns;
import net.micode.notes.data.Notes.DataConstants;
import net.micode.notes.data.Notes.NoteColumns;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintStream;
/**
* 备份工具类 - 用于将笔记导出为文本格式
* 采用单例模式设计，提供笔记数据导出到外部存储的功能
*/
public class BackupUtils {
private static final String TAG = "BackupUtils";
// 单例实例
private static BackupUtils sInstance;
/**
* 获取BackupUtils的单例实例
* @param context 上下文对象
* @return BackupUtils实例
*/
public static synchronized BackupUtils getInstance(Context context) {
if (sInstance == null) {
sInstance = new BackupUtils(context);
}
return sInstance;
}
/**
* 以下状态码用于表示备份或还原操作的状态
*/
// 当前SD卡未挂载
public static final int STATE_SD_CARD_UNMOUONTED = 0;
// 备份文件不存在
public static final int STATE_BACKUP_FILE_NOT_EXIST = 1;
// 数据格式不正确，可能被其他程序修改
public static final int STATE_DATA_DESTROIED = 2;
// 运行时异常导致还原或备份失败
public static final int STATE_SYSTEM_ERROR = 3;
// 备份或还原成功
public static final int STATE_SUCCESS = 4;
// 文本导出器
private TextExport mTextExport;
/**
* 私有构造函数，初始化文本导出器
* @param context 上下文对象
*/
private BackupUtils(Context context) {
mTextExport = new TextExport(context);
}
/**
* 检查外部存储是否可用（已挂载）
* @return 如果外部存储已挂载则返回true，否则返回false
*/
private static boolean externalStorageAvailable() {
return Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState());
}
/**
* 将所有笔记导出为文本格式
* @return 导出状态码
*/
public int exportToText() {
return mTextExport.exportToText();
}
/**
* 获取导出的文本文件名
* @return 导出的文件名
*/
public String getExportedTextFileName() {
return mTextExport.mFileName;
}
/**
* 获取导出的文本文件目录
* @return 导出的文件目录路径
*/
public String getExportedTextFileDir() {
return mTextExport.mFileDirectory;
}
/**
* 文本导出内部类 - 负责将笔记数据导出为可读的文本格式
*/
private static class TextExport {
// 笔记查询投影字段：ID、修改日期、摘要、类型
private static final String[] NOTE_PROJECTION = {
NoteColumns.ID,
NoteColumns.MODIFIED_DATE,
NoteColumns.SNIPPET,
NoteColumns.TYPE
};
private static final int NOTE_COLUMN_ID = 0; // ID列索引
private static final int NOTE_COLUMN_MODIFIED_DATE = 1; // 修改日期列索引
private static final int NOTE_COLUMN_SNIPPET = 2; // 摘要列索引
// 数据查询投影字段：内容、MIME类型、DATA1-DATA4
private static final String[] DATA_PROJECTION = {
DataColumns.CONTENT,
DataColumns.MIME_TYPE,
DataColumns.DATA1,
DataColumns.DATA2,
DataColumns.DATA3,
DataColumns.DATA4,
};
private static final int DATA_COLUMN_CONTENT = 0; // 内容列索引
private static final int DATA_COLUMN_MIME_TYPE = 1; // MIME类型列索引
private static final int DATA_COLUMN_CALL_DATE = 2; // 通话日期列索引
private static final int DATA_COLUMN_PHONE_NUMBER = 4; // 电话号码列索引
// 文本格式化模板数组
private final String [] TEXT_FORMAT;
private static final int FORMAT_FOLDER_NAME = 0; // 文件夹名称格式索引
private static final int FORMAT_NOTE_DATE = 1; // 笔记日期格式索引
private static final int FORMAT_NOTE_CONTENT = 2; // 笔记内容格式索引
private Context mContext; // 上下文对象
private String mFileName; // 导出的文件名
private String mFileDirectory; // 导出的文件目录
/**
* 构造函数，初始化文本导出器
* @param context 上下文对象
*/
public TextExport(Context context) {
TEXT_FORMAT = context.getResources().getStringArray(R.array.format_for_exported_note);
mContext = context;
mFileName = "";
mFileDirectory = "";
}
/**
* 获取指定索引的格式化模板
* @param id 格式索引
* @return 格式化字符串模板
*/
private String getFormat(int id) {
return TEXT_FORMAT[id];
}
/**
* 将指定文件夹及其中的笔记导出为文本格式
* @param folderId 文件夹ID
* @param ps 打印流对象，用于写入文本
*/
private void exportFolderToText(String folderId, PrintStream ps) {
// 查询属于此文件夹的所有笔记
Cursor notesCursor = mContext.getContentResolver().query(Notes.CONTENT_NOTE_URI,
NOTE_PROJECTION, NoteColumns.PARENT_ID + "=?", new String[] {
folderId
}, null);
if (notesCursor != null) {
if (notesCursor.moveToFirst()) {
do {
// 输出笔记的最后修改日期
ps.println(String.format(getFormat(FORMAT_NOTE_DATE), DateFormat.format(
mContext.getString(R.string.format_datetime_mdhm),
notesCursor.getLong(NOTE_COLUMN_MODIFIED_DATE))));
// 查询属于此笔记的数据
String noteId = notesCursor.getString(NOTE_COLUMN_ID);
exportNoteToText(noteId, ps);
} while (notesCursor.moveToNext());
}
notesCursor.close();
}
}
/**
* 将指定ID的笔记导出为文本并写入打印流
* @param noteId 笔记ID
* @param ps 打印流对象，用于写入文本
*/
private void exportNoteToText(String noteId, PrintStream ps) {
Cursor dataCursor = mContext.getContentResolver().query(Notes.CONTENT_DATA_URI,
DATA_PROJECTION, DataColumns.NOTE_ID + "=?", new String[] {
noteId
}, null);
if (dataCursor != null) {
if (dataCursor.moveToFirst()) {
do {
String mimeType = dataCursor.getString(DATA_COLUMN_MIME_TYPE);
if (DataConstants.CALL_NOTE.equals(mimeType)) {
// 处理通话记录类型的笔记
// 输出电话号码
String phoneNumber = dataCursor.getString(DATA_COLUMN_PHONE_NUMBER);
long callDate = dataCursor.getLong(DATA_COLUMN_CALL_DATE);
String location = dataCursor.getString(DATA_COLUMN_CONTENT);
if (!TextUtils.isEmpty(phoneNumber)) {
ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT),
phoneNumber));
}
// 输出通话日期
ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT), DateFormat
.format(mContext.getString(R.string.format_datetime_mdhm),
callDate)));
// 输出通话附件位置
if (!TextUtils.isEmpty(location)) {
ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT),
location));
}
} else if (DataConstants.NOTE.equals(mimeType)) {
String content = dataCursor.getString(DATA_COLUMN_CONTENT);
if (!TextUtils.isEmpty(content)) {
ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT),
content));
}
}
} while (dataCursor.moveToNext());
}
dataCursor.close();
}
// 在笔记之间打印分隔符
try {
ps.write(new byte[] {
Character.LINE_SEPARATOR, Character.LETTER_NUMBER
});
} catch (IOException e) {
Log.e(TAG, e.toString());
}
}
/**
* 将笔记导出为用户可读的文本格式
* 包括文件夹笔记和根目录下的笔记
* @return 导出状态码
*/
public int exportToText() {
if (!externalStorageAvailable()) {
Log.d(TAG, "Media was not mounted");
return STATE_SD_CARD_UNMOUONTED;
}
PrintStream ps = getExportToTextPrintStream();
if (ps == null) {
Log.e(TAG, "get print stream error");
return STATE_SYSTEM_ERROR;
}
// 首先导出文件夹及其包含的笔记
Cursor folderCursor = mContext.getContentResolver().query(
Notes.CONTENT_NOTE_URI,
NOTE_PROJECTION,
"(" + NoteColumns.TYPE + "=" + Notes.TYPE_FOLDER + " AND "
+ NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER + ") OR "
+ NoteColumns.ID + "=" + Notes.ID_CALL_RECORD_FOLDER, null, null);
if (folderCursor != null) {
if (folderCursor.moveToFirst()) {
do {
// 获取文件夹名称
String folderName = "";
if(folderCursor.getLong(NOTE_COLUMN_ID) == Notes.ID_CALL_RECORD_FOLDER) {
folderName = mContext.getString(R.string.call_record_folder_name);
} else {
folderName = folderCursor.getString(NOTE_COLUMN_SNIPPET);
}
if (!TextUtils.isEmpty(folderName)) {
ps.println(String.format(getFormat(FORMAT_FOLDER_NAME), folderName));
}
String folderId = folderCursor.getString(NOTE_COLUMN_ID);
exportFolderToText(folderId, ps);
} while (folderCursor.moveToNext());
}
folderCursor.close();
}
// 导出根目录下的笔记
Cursor noteCursor = mContext.getContentResolver().query(
Notes.CONTENT_NOTE_URI,
NOTE_PROJECTION,
NoteColumns.TYPE + "=" + +Notes.TYPE_NOTE + " AND " + NoteColumns.PARENT_ID
+ "=0", null, null);
if (noteCursor != null) {
if (noteCursor.moveToFirst()) {
do {
// 输出笔记的最后修改日期
ps.println(String.format(getFormat(FORMAT_NOTE_DATE), DateFormat.format(
mContext.getString(R.string.format_datetime_mdhm),
noteCursor.getLong(NOTE_COLUMN_MODIFIED_DATE))));
// 查询属于此笔记的数据
String noteId = noteCursor.getString(NOTE_COLUMN_ID);
exportNoteToText(noteId, ps);
} while (noteCursor.moveToNext());
}
noteCursor.close();
}
ps.close();
return STATE_SUCCESS;
}
/**
* 获取指向导出文件的打印流
* 文件位置由{@link #generateFileMountedOnSDcard}方法生成
* @return 打印流对象，如果创建失败则返回null
*/
private PrintStream getExportToTextPrintStream() {
File file = generateFileMountedOnSDcard(mContext, R.string.file_path,
R.string.file_name_txt_format);
if (file == null) {
Log.e(TAG, "create file to exported failed");
return null;
}
mFileName = file.getName();
mFileDirectory = mContext.getString(R.string.file_path);
PrintStream ps = null;
try {
FileOutputStream fos = new FileOutputStream(file);
ps = new PrintStream(fos);
} catch (FileNotFoundException e) {
e.printStackTrace();
return null;
} catch (NullPointerException e) {
e.printStackTrace();
return null;
}
return ps;
}
}
/**
* 生成用于存储导出数据的文本文件
* 文件位于SD卡的指定目录下，文件名包含日期信息
* @param context 上下文对象
* @param filePathResId 文件路径的资源ID
* @param fileNameFormatResId 文件名格式的资源ID
* @return 生成的文件对象，如果创建失败则返回null
*/
private static File generateFileMountedOnSDcard(Context context, int filePathResId, int fileNameFormatResId) {
// 构建文件目录路径
StringBuilder sb = new StringBuilder();
sb.append(Environment.getExternalStorageDirectory());
sb.append(context.getString(filePathResId));
File filedir = new File(sb.toString());
// 构建完整文件路径（包含文件名和日期）
sb.append(context.getString(
fileNameFormatResId,
DateFormat.format(context.getString(R.string.format_date_ymd),
System.currentTimeMillis())));
File file = new File(sb.toString());
try {
// 如果目录不存在，则创建目录
if (!filedir.exists()) {
filedir.mkdir();
}
// 如果文件不存在，则创建新文件
if (!file.exists()) {
file.createNewFile();
}
return file;
} catch (SecurityException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}
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